Lecturers’ Guide to Part 2 Motor Vehicle Craft Studies

Frontmatter

Clutches

Abstract

A simple multi-spring type of clutch is illustrated below. Label the drawing and state the function and operation of the parts listed opposite.

John Whipp, Roy Brooks

Hydraulic Couplings and Torque Converters

Abstract

A fluid flywheel is an hydraulic coupling which is used as an automatic clutch in the transmission system of a vehicle. The unit consists of two main elements, an impeller or driving member and a rotor or driven member. The unit is almost completely filled with fluid. As the engine, and hence the impeller, rotate, the fluid begins to circulate; this transfers torque to the rotor and consequently the gearbox input shaft.

John Whipp, Roy Brooks

Gearboxes

Abstract

Basically the gearbox serves three purposes:

1.

To multiply (or increase) the torque (turning effort) being transmitted by the engine.

 

2.

To provide a means of reversing the vehicle.

 

3.

To provide a permanent position of neutral.

 

John Whipp, Roy Brooks

Universal Joints/Propeller Shafts/Drive Arrangements

Abstract

The propeller shaft transmits the drive from the gearbox to the final-drive gear. The flexibility in the drive is provided by universal joints.

John Whipp, Roy Brooks

Final-drive/Differential and Axle Shafts

Abstract

The pair of gears providing the final drive are usually a bevel pinion and crown wheel or a worm and wheel. In many front-wheel-drive arrangements the final drive consists of a pair of helical gears similar to those used in most gearboxes.

John Whipp, Roy Brooks

Tyres and Wheels

Abstract

The modern tyre has evolved over the past 100 years from the simple pneumatic cycle tyre to the sophisticated tread and cord structures of today.

John Whipp, Roy Brooks

Suspension

Abstract

The multi-leaf spring suspension is an extremely simple suspension system which is widely used at the rear of many cars and all round on the majority of heavy goods vehicles. The length, width, thickness and number of leaves varies according to the load requirement. One of this system’s advantages is that it can provide total axle location to its springing properties.

John Whipp, Roy Brooks

Steering

Abstract

When a vehicle travels on a curved path during cornering, true rolling is obtained only when the wheels roll on arcs which have a ‘common centre’ or common axis. Show the common centre on the drawing below.

John Whipp, Roy Brooks

Braking Systems

Abstract

Examine the front drum brake assembly of a car and complete the drawing below to show the 2LS arrangement. Add arrowş to the drawing to indicate forward drum rotation and the direction of wheel cylinder piston movement.

John Whipp, Roy Brooks

Vehicle Structure

Abstract

The major units on a vehicle, e.g. engine, transmission and suspension, are usually attached to the chassis or body structure through rubber blocks. The rubber serves to reduce noise and prevent vibration from being transmitted through the structure.

John Whipp, Roy Brooks

Material Joining

Abstract

List ten safety precautions to be observed when storing compressed gas cylinders.

John Whipp, Roy Brooks